Scott Sumner on What Milton Friedman Would Think of Monetary Policy Today

Episode Summary

Executive Summary: The episode examines Milton Friedman’s evolving monetary theory through Scott Sumner’s reading of Ed Nelson’s Friedman biography. It argues Friedman moved from early functional-finance ideas to monetarism, then influenced macroeconomics mainly by dismantling Keynesian views on interest rates, fiscal policy, the Phillips curve, and cost-push inflation. The discussion ends by applying Friedman’s logic to modern policy debates like QE, the ZLB, and nominal GDP targeting.

Main Topics: Friedman’s intellectual evolution (Priority: 5/5): Sumner highlights how Friedman’s views changed substantially over time: from early countercyclical reserve-financed deficits to monetarist money-growth rules, and later more pragmatic openness to inflation targeting and break-even inflation targeting. Ed Nelson’s biography and historical interpretation (Priority: 4/5): The hosts praise Nelson’s two-volume Friedman biography as authoritative because it combines history of thought with deep monetary theory, allowing Friedman’s shifting positions to be read in context. Four Keynesian ideas Friedman successfully challenged (Priority: 5/5): Sumner argues Friedman overturned four major Keynesian claims: that nominal interest rates reveal policy stance, that fiscal policy controls inflation, that there is a long-run Phillips-curve tradeoff, and that cost-push inflation justifies wage-price controls. Friedman’s legacy in New Keynesian macro (Priority: 5/5): The conversation claims Friedman’s critiques became embedded in New Keynesian thinking by the 1980s, especially through real-vs-nominal rate analysis, the natural rate concept, and skepticism about controls and fiscal activism. Modern policy analogies and what Friedman might say today (Priority: 4/5): Sumner and Beckworth speculate about Friedman’s reactions to M2 surges, the zero lower bound, reserve remuneration, global dollar swap lines, and nominal GDP level targeting, suggesting his views would likely have evolved toward market monetarism. Inflation as a nominal phenomenon (Priority: 5/5): A central theme is that persistent inflation requires persistently faster money growth, while fiscal policy or price controls can at most change the price level once, not the ongoing inflation trend.

Key Arguments: Friedman’s true legacy is not a specific money-growth rule but his successful critique of traditional Keynesian macroeconomics. Nominal interest rates alone are a poor guide to monetary stance because inflation expectations and real rates matter. Fiscal austerity or tax increases may alter the price level briefly, but they do not sustain lower inflation without slower money growth. The long-run Phillips curve is vertical because unemployment returns to its natural rate regardless of inflation. Cost-push inflation and wage-price controls treat symptoms, not the monetary source of persistent inflation. If money growth is permanently faster, inflation rises persistently; non-monetary factors generally cause only one-off level changes. Friedman would likely have been more sympathetic to nominal GDP targeting than is often assumed, because stable money growth implies stable NGDP growth if velocity is stable. At the zero lower bound, Friedman likely underestimated the importance of expectations management and reserve demand, and might have been influenced by market monetarist and Princeton-school ideas. The Fed, not fiscal deficits, is portrayed as the primary controller of trend inflation in normal U.S. conditions. The rise of New Keynesian models reflects the absorption of Friedman’s critiques rather than the preservation of old Keynesian doctrines.

Data Points: Volume length of Nelson biography: 2 volumes; first volume about 700+ pages, second about 500+ pages - Beckworth emphasizes the size and comprehensiveness of Ed Nelson’s Friedman biography Friedman’s proposed reserve-financed deficit approach: 100% reserve creation financing government deficits - Discussion of Friedman’s early 1940s functional-finance-like views Target money growth rate: 3% to 4% per year - Friedman’s preferred steady growth rate for monetary aggregates in his later monetarist phase Zero lower bound / optimal quantity of money: Near 0% nominal interest rates - Referenced in discussing Friedman’s optimal quantity of money and later zero-rate debates Phillips-curve critique year: 1968 - Friedman’s AEA presidential address challenging the long-run inflation-unemployment tradeoff Late-1960s unemployment and inflation: Unemployment over 6% and inflation about 5.5% by end-1970 - Used as evidence that the Phillips curve tradeoff failed in practice U.S. debt-to-GDP in the 1960s and 1970s: Approximately 30% to 50% of GDP - Used to argue deficits were not large enough to explain the inflation through fiscal dominance Current U.S. debt-to-GDP: Over 100% of GDP - Contrasted with the 1960s/70s to show modern fiscal conditions differ materially Friedman’s 1992 book: Money Mischief - Cited as a late-career work where Friedman endorsed Bob Hetzel’s break-even inflation targeting idea Great Inflation duration after controls: About a year to a little over a year before controls failed - Describes the temporary effect of Nixon’s wage-price controls

Pivotal Quotes: "I think his real influence was his critique of Keynesian economics." — Scott Sumner: Sumner reframes Friedman’s legacy away from money-growth targeting toward his attack on Keynesian macro "Inflation is a nominal phenomenon." — Scott Sumner: Used to summarize Friedman’s view that persistent inflation requires persistent monetary expansion "treating the symptom and not the underlying cause of inflation" — Scott Sumner: His characterization of wage-price controls and other non-monetary anti-inflation policies

Implications: The episode suggests central banks should focus on nominal aggregates and expectations rather than headline interest rates or ad hoc controls. It also implies Friedman remains relevant to modern debates on NGDP targeting, the ZLB, and inflation management.